How would I call a generator function from an imported libraries callback?

// Provides CloudWatchService
export const SegmentServiceLive = Layer.effect(
  SegmentService,
  Effect.gen(function* () {
    const cloudWatchService = yield* CloudWatchService
    const analytics = new Analytics({ writeKey: writeKey })
    analytics.on('error', onErrorCallback)
  }),
)  

// Requires CloudWatchService
const onErrorCallback = (error: any) => Effect.gen(function* () {
  console.log(`Segment callback: track event sent: ${JSON.stringify(event)}`)
  // need access to CloudWatchService here
  const cloudWatchService = yield* CloudWatchService
  yield* cloudWatchService.emit({ ... })
})